Who determines the kVp setting and what is it based on?

• A. The dentist, based on the desired image contrast
• B. The patient, based on pain tolerance
• C. The radiographer, based on standard operating procedure for all patients
• D. The manufacturer, based on film speed

Answer: (A)

The main idea is that kVp is chosen to achieve the right level of image contrast for diagnosing the patient’s condition. Kilovoltage peak controls how well x-ray photons penetrate tissues, which directly influences how dark or light different structures appear on the image. Higher kVp makes the image more grayscale with less contrast, while lower kVp makes the image higher in contrast with more distinct black-and-white differences. Because different dental structures and pathologies require different contrast to be visible—such as distinguishing enamel from dentin, or identifying bone loss versus surrounding tissues—the clinician who oversees the radiographic exam selects the kVp to provide the needed contrast for accurate diagnosis. The radiographer may follow a technique chart or standard procedures to implement that setting, but the choice is based on diagnostic needs rather than patient comfort, the manufacturer, or a one-size-fits-all rule.